/*
 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 *		operating system.  INET is implemented using the  BSD Socket
 *		interface as the means of communication with the user level.
 *
 *		Definitions for the ICMP protocol.
 *
 * Version:	@(#)icmp.h	1.0.3	04/28/93
 *
 * Author:	Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 */
#ifndef _LINUX_ICMP_H
#define	_LINUX_ICMP_H

#include <linux/types.h>

#define ICMP_ECHOREPLY		0	/* Echo Reply                   */
#define ICMP_DEST_UNREACH	3	/* Destination Unreachable      */
#define ICMP_SOURCE_QUENCH	4	/* Source Quench                */
#define ICMP_REDIRECT		5	/* Redirect (change route)      */
#define ICMP_ECHO		8	/* Echo Request                 */
#define ICMP_TIME_EXCEEDED	11	/* Time Exceeded                */
#define ICMP_PARAMETERPROB	12	/* Parameter Problem            */
#define ICMP_TIMESTAMP		13	/* Timestamp Request            */
#define ICMP_TIMESTAMPREPLY	14	/* Timestamp Reply              */
#define ICMP_INFO_REQUEST	15	/* Information Request          */
#define ICMP_INFO_REPLY		16	/* Information Reply            */
#define ICMP_ADDRESS		17	/* Address Mask Request         */
#define ICMP_ADDRESSREPLY	18	/* Address Mask Reply           */
#define NR_ICMP_TYPES		18

/* Codes for UNREACH. */
#define ICMP_NET_UNREACH	0	/* Network Unreachable          */
#define ICMP_HOST_UNREACH	1	/* Host Unreachable             */
#define ICMP_PROT_UNREACH	2	/* Protocol Unreachable         */
#define ICMP_PORT_UNREACH	3	/* Port Unreachable             */
#define ICMP_FRAG_NEEDED	4	/* Fragmentation Needed/DF set  */
#define ICMP_SR_FAILED		5	/* Source Route failed          */
#define ICMP_NET_UNKNOWN	6
#define ICMP_HOST_UNKNOWN	7
#define ICMP_HOST_ISOLATED	8
#define ICMP_NET_ANO		9
#define ICMP_HOST_ANO		10
#define ICMP_NET_UNR_TOS	11
#define ICMP_HOST_UNR_TOS	12
#define ICMP_PKT_FILTERED	13	/* Packet filtered */
#define ICMP_PREC_VIOLATION	14	/* Precedence violation */
#define ICMP_PREC_CUTOFF	15	/* Precedence cut off */
#define NR_ICMP_UNREACH		15	/* instead of hardcoding immediate value */

/* Codes for REDIRECT. */
#define ICMP_REDIR_NET		0	/* Redirect Net                 */
#define ICMP_REDIR_HOST		1	/* Redirect Host                */
#define ICMP_REDIR_NETTOS	2	/* Redirect Net for TOS         */
#define ICMP_REDIR_HOSTTOS	3	/* Redirect Host for TOS        */

/* Codes for TIME_EXCEEDED. */
#define ICMP_EXC_TTL		0	/* TTL count exceeded           */
#define ICMP_EXC_FRAGTIME	1	/* Fragment Reass time exceeded */

struct icmphdr {
	__u8 type;
	__u8 code;
	__sum16 checksum;
	union {
		struct {
			__be16 id;
			__be16 sequence;
		} echo;
		__be32 gateway;
		struct {
			__be16 __unused;
			__be16 mtu;
		} frag;
	} un;
};

#ifdef __KERNEL__
#include <linux/skbuff.h>

static inline struct icmphdr *icmp_hdr(const struct sk_buff *skb)
{
	return (struct icmphdr *)skb_transport_header(skb);
}
#endif

/*
 *	constants for (set|get)sockopt
 */

#define ICMP_FILTER			1

struct icmp_filter {
	__u32 data;
};

#endif /* _LINUX_ICMP_H */
